The coverage calculator quickly helps you determine how much insulation you need to insulate the ceiling or wall of a house. Simply select the Bradford ceiling or wall segment from the product drop down, then the R value of the segment you intend to use. Select the width of your segment which should correspond to the widths of the ceiling joists/wall studs/floor joists where you intend to fit your segments. Enter the area to cover and the calculator will determine the number of packs you need.